If you can visualise this, you are ready to attend interviews

C questions :

  • When memory leak will become problem ?
  • Why/when segmentation fault occurs ?
  • How shared library is useful ? effect of global present in shared library in two process linked with same library.
  • function pointers and use of dlsym/dlopen
  • Need of const and non-const variable and functions.
  • Why pointer is created with data type ?

Data structure :

  • What is diff in start/head and other nodes of link list ?
  • Sizeof head pointer and size of any other node in link list
  • Delete node having provided number
  • Tree traversal
  • Difference in vector and list
  • In which type of problems map is useful ?
  • find time complexity of all your written program.
  • How to achieve O ( log n ) complexity for search in sorted array.

C++ question :

  • need of constructor, copy constructor and destructor
  • Use of Virtual and advantage of virtual ?
  • Problems which can occur when default argument/function overloading is used with virtual ?
  • Why static method is required in class ?
  • how to read data from given file(configuration) and parse it using string in c++.
  • when to use template and when function overloading
  • how function overloading is achieved in c++

OS questions :

  • What will you choose in process/thread to create your application considering IPC and crashes.
  • scheduling of process/thread on single processor and
  • multiprocessor system.
  • why mutex/semaphore is required and when to use it ?
  • system call vs signals

Puzzles : 

  • You have 8 liter of water in a tank. You have two bucket 3 Litre and 5 Liter. How can you divide it half.( 4 L )
  • There are 12 black and 12 white shocks in a drawer. In complete darkness how many shocks need to be taken out to get a matching pair.
  • A man has to cross river with all 3 animal(2 goat and one wolf) and himself. A boat is available which can take only 3 creatures at a time including man. Wolf won't harm goat till man is nearby. Can man reach to other side of river with 2 goat and one wolf ?

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